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Manager
Joined: 31 Mar 2006
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Is m+z>0?
1) m-3z>0?
2)m-4z<0?
Please explain.Thanks
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Director
Joined: 16 Aug 2005
Posts: 950
Location: France
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1)
m-3z>0
m>3z
m>z
not sufficient
2)
m-4z>0
m>4z
m>z
not sufficient.
Together, not sufficient either (as both mean the same thing).
Hence E
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Senior Manager
Joined: 09 Mar 2006
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1) m > 3z Obviously insuff.
2) m< 4z as above
However (1) + (2) imply that 3z < m < 4z , hence 3z < 4z this holds true
only for z > 0. Since z > 0 , m > 3z > 0 . Hence m+z > 0 . Sufficient.
C it is
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Director
Joined: 16 Aug 2005
Posts: 950
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oops ... my silly mistake. I took (2) as m-3z>0
agree, C
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SVP
Joined: 01 May 2006
Posts: 1837
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I would say (C),
1) gives m>3z
Not sufficient
2) gives m < 4z
Not sufficient as well
(1) and (2) implies :
3z < m < 4z which means z > 0
(otherwise for exemple if z=-1 , we cannot say -3 < m < -4 : m < -4 and m > -3)
it emplies that m > 0 and so m + z >0
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SVP
Joined: 01 May 2006
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doewl.... u write it faster than me and during the time that i did it 
I would not anwser on it if I saw your explanation  Actually clearer than mine with 4z > 3z gives z > 0
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Senior Manager
Joined: 09 Mar 2006
Posts: 448
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Fig wrote: doewl.... u write it faster than me and during the time that i did it I would not anwser on it if I saw your explanation Actually clearer than mine with 4z > 3z gives z > 0 Oh.. don't worry, typing skills are ( unfortunately) not tested on GMAT 
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SVP
Joined: 01 May 2006
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He he he
But should be helpfull at least for the 2 essays
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VP
Joined: 29 Dec 2005
Posts: 1356
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Fig wrote: I would say (C),
1) gives m>3z
Not sufficient
2) gives m < 4z
Not sufficient as well
(1) and (2) implies :
3z < m < 4z which means z > 0
(otherwise for exemple if z=-1 , we cannot say -3 < m < -4 : m < -4 and m > -3)
it emplies that m > 0 and so m + z >0
agree with you, Fig(o?).
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SVP
Joined: 01 May 2006
Posts: 1837
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Professor, as i had no idea of what should mean Figo... I take my chance on google... The first website inside the answer's list is http://www.figo.org/ 
I decided to not go further
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VP
Joined: 29 Dec 2005
Posts: 1356
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Fig wrote: Professor, as i had no idea of what should mean Figo... I take my chance on google... The first website inside the answer's list is http://www.figo.org/ I decided to not go further this is world cup football (soccor) season. therefore i happen to remember Louis Figo, one of the top player of the europe (portugal). i dont know more than this..............
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SVP
Joined: 01 May 2006
Posts: 1837
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Ok... I see know
Actually, i don't know a lot about football... It's revealed now
U would wonder if it's normal for a french guy ... Perhaps not :D
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